Air duct riveting installation in biological purification workshop

Air duct riveting installation in biological purification workshop

There are many ways to connect air ducts and accessories with metal sheets in biological purification workshops. When should rivets be used?

1. Riveting requirements

Riveting connection, referred to as riveting for short, is to overlap the edges of the two plates to be connected according to the specified size, and then use rivets to pierce...

Text label: biological purification pharmaceutical cleanroom, air duct installation in purification workshop

Riveting installation of air duct in biological purification workshop

There are many ways to connect air ducts and accessories with metal sheets in biological purification workshops. When should rivets be used?

1. Riveting requirements

Riveting connection, referred to as riveting for short, is to overlap the edges of the two sheets to be connected according to the specified size, and then riveted together with rivets. Riveting is generally used in the production of air ducts when the plate is thick and cannot be bitten, or the plate is not thick but the texture is brittle and cannot be connected by biting. In addition, the connection between the air duct and the angle steel flange or the components attached to the air duct still needs to use riveting.

In the production of air ducts in the biological purification workshop, if riveting is required to connect the plates, the rivet diameter, rivet length and spacing between rivets should be selected according to the plate thickness; the rivet diameter du003d2s, s is the plate thickness, but d shall not be less than 3mm; in order to make the rivet into a pressure cap to compress the plate, the length L of the rivet can be selected according to 2~3 times the diameter, or Lu003d2s+(1.5~2)d; the distance from the center of the rivet hole to the edge of the plate Bu003d(3~4)d, the spacing A between the rivets is generally 40~100mm. When the air duct is tight, the spacing should be smaller, and the rivets should be arranged neatly and symmetrically; the diameter of the rivet hole can only be larger than the diameter of the rivet. The rivet should be 0.2mm larger and should not be too large. The center of the rivet must be perpendicular to the board surface. The rivet should press the board tightly to make the board seam close.

2. Riveting operation

The riveting operation adopts manual riveting or mechanical riveting according to the specific situation. In the manual riveting operation, the plate is first marked to determine the position of the rivet, then the rivet hole is drilled according to the diameter of the rivet, then the rivet is inserted, the nail tail is piled up with a hammer, and then the rivet is punched with a cover die (rivet kezi). rivet cap in a semicircle. In order to prevent the wrong hole caused by the displacement of the plate during riveting, the rivet holes at both ends can be drilled first, riveted first, and then riveted in the middle. Mechanical riveting commonly used are portable electric hydraulic riveting machine, long arm riveting machine, electric riveting gun and manual riveting gun.

Portable electric hydraulic riveting machine is a small tool in the production of air ducts. It is mainly used for riveting of air ducts, angle steel flanges and other components. The rivets with a diameter of 4mm are uniformly used for riveting ∟25×25×3~∟50× The 50×4 angle steel method can complete the punching and riveting process of the thin steel plate.

Riveting guns are also commonly used tools for riveting by ventilators, including manual riveting guns and electric riveting guns. Pull riveting is often used in occasions where only one side operation is possible and cannot be operated inside or outside. For example, when opening a tee and opening an air outlet on the air duct, it can only be operated outside the air duct, so pull riveting is used.

The commonly used manual riveting guns are SLM-1 and SLM-2. The scope of application is: SLM-1. The diameter of the riveting head is ф2mm, ф2.5mm, and the range of pulling aluminum rivets is ф3~ ф4mm. SLM-2 type, the diameter of the riveting head is 2.5~3.5mm, and the pulling range of the blind aluminum rivet is ф3~ф5mm. Zhongjing Global Purification can provide consulting, planning, design, construction, installation and transformation of sterile workshops and purification workshops and other supporting services.

The following matters should be paid attention to when carrying out the riveting operation:

First choose the rivet head, use the shaft of the rivet to match the hole diameter of the rivet head, it is advisable to slide, and tighten the selected rivet head on the conduit; loosen the cap on the conduit, put the Pull out the guide tube a little so that the hole of the rivet head faces upwards; open the handle of the manual riveting gun to a large extent, insert the rivet shaft into the hole of the rivet head, and rotate the guide tube at the same time, so that the rivet shaft can fall freely and cannot be adjusted Too loose, so as not to damage the parts, and then tighten the cap; the gap between the rivet hole and the rivet should be a sliding fit, the rivet hole can only be 0.2mm larger than the rivet, and the gap will affect the riveting strength; Insert the rivet into the hole of the riveted steel plate , Open the handle of the riveting gun, so that the riveting head is all sleeved into the riveting shaft, clamp the steel plate to be riveted, then clamp the riveting gun handle, and break the rivet shaft to complete the riveting. Sometimes the rivet shaft cannot be broken at one time, and the previous action can be repeated; then, open the handle of the rivet gun and take out the rivet shaft.

The appearance of the electric riveting gun is like a hand drill. The main technical parameters of the more commonly used P1M-5 electric riveting gun are: voltage 202V, rated current 1.4A, input power 300W, maximum pulling force 7500N, larger pulling force Rivet ф5mm, weight 2.5kg.

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